Electric-arc welding



March 3, 1931. H. J. BURNI'SH 1,794,363

ELECTRIC ARC WELDING" Filed Nov. 2. 1929 FIG. 1.,

INVENTOR.

4 Howard JBumish zzmu ATTORNEY.

Patented Mar. 3, 1931 1,794,363

UNITED STATES PATENT OFFICE HOWARD :r. BUENISE, F MILWAUKEE, WISCONSIN r ELECTRIC-ARC WELDING Application filed lil'ovember 2, 1929. Serial No. 404,413.

This invention relates to electric arc weldand other contaminating elements from the ing. weld and enables the production of a weld The object of the invention isto provide of the parent metal stock having an absence a welded seam inlsheet or plate metal which of blow holes and other defects, and having has increased tensile strength and ductility. high tensile strength and ductility.

Another object of the invention is to pro- I claim: vide a welding scarf for the edges to be l. In electric arc welding, the steps which welded which will facilitate the welding comprise providing tapered interlocking operation and enable the Welding of metal edges for the parts being welded removing sheets by a single pass of the electric weldthe outer corners of the meeting edges to 60 ing arc alongthe edges. provide a groove along the seam to be Other objects Will appear hereinafter with Welded, and electric .arc welding said edges reference to the embodiment illustrated in together. the accompanying-drawings in which the i 2. In electric welding, the steps which 6 views are as follows: comprise providing a tapered tongue and 65 Fig. 1 is a top plan iew of a pipe section groove for interlocking the edges of the showing the operation of welding a longiparts being welded, pressin said edges to lil tudinal seam therein. I gether, and progressively using the same Fig. 2 is a fragmentary section of the'pipe together by the application of an electric on line 2-2 of Fig. l. are thereto. 70

Fig. 3'is a similar section on line 33 of 3. In electric arc welding, the steps which Fig. 1. comprise providing a tapered complemen- In carrying out the invention the edges 1 tary tongue and groove for interlocking theand 2 of the pipe 3 or other article to be edges of the parts being welded, pressing welded are formed to provide a tongue and said edges together, and applying an electric 75 groove interlock therebetween. The edge 1 are there along to heat said interlocked-edges is tapered to fit into the tapered recess or and weld the same together. groove in the edge 2. The outer corner 4 of In witness whereof, I have signed my name the edge 2 is preferably cut away to proat Milwaukee, Wisconsin, this 31st day of vide a small groove 5 along the seam to be October, 1929. so

welded.- HOWARD J. BURNISH In the welding operation, the edges 1 and 2 are pressed in interlocked position and an electrode 6 is passed along the scam in areing relation thereto. The electrode 6 is prefs5 erably of fusible metal which is melted by the arc and deposited along the seam to provide a weld 7 'of proper thickness. A chill block 8, having a groove therein, molds the 40 lower part of the edges and Weld, and prevents injury to the work due to the high concentration of heat by the are required to ob- 'tain the complete penetration of the weld through the edges.

The interlocking of the. edges alines the same and allows the application of pressure thereto during the welding operation with out danger of disalinement of the edges. Furthermore, the tapered fit of the tongue 50 and groove interlocked edges excludes air 

